CHEMICAL THINNING - APPLES
K-Salt Fruit Fix 200 is an auxin hormone type product for use in fruit production, The response of fruit trees to application may be varied in different years. In reviewing the results, the grower needs to consider the wide variation in varieties, climatic factors, dosage, tree vigor, and fruit set before choosing the desired rate and correct timing for application.
Apply in sufficient water for good even coverage with your specific equipment. Application can be made in as little ask 50 gallons of water per acre, and up to 400 gallons of water per acre and is highly dependent on type of equipment used and density of the foliage. Uniform and even distribution of the spray is imperative. For rates and application timing for your specific variety and location, consult your local extension pomologist or specialist for recommendations.
APPLES AND PEARS
Chemical Thinning - Apples
Because of differences in varieties, climatic factors, tree vigor and fruit set, the application rate for thinning can range from 2 to 20 ppm and application timing can range from petal fall to 30 days after full bloom (2.4 fl. oz. of K-Salt Fruit Fix 200 in 100 gallons of water will make 10 ppm spray). The higher concentrations should be limited to vigorous trees with high fruit set potential. Use the lower concentrations for weaker, less vigorous trees and less food reserves and lower fruit set potential: Use 2 to 5 ppm when a surfactant (wetting agent) is added. Use surfactant (wetting agent) according to manufacturer's recommendations, but not more than 1 pint per 100 gallons of spray. Mid-season to late blooming varieties such as Red Delicious, Golden Delicious, Fuji, Gala, Granny Smith and Romes should be treated 5 to 21 days after full bloom depending on locality and other factors. For concentrate spray, use K-Salt Fruit Fix 200 at the rate of 2.0 fl. oz. to 4.0 fl. oz. per acre. Application in sufficient water for uniform and even distribution of the spray is imperative.
Thinning sprays are most effective when the king apple fruitlets are between 5 mm to 10 mm in diameter. During cool springs, delay application as necessary until the largest fruits are 7 - 10 mm in diameter and forecasted daytime temperatures are likely to rise above 60° F within the next five days. The preferred application temperature is between 70° F\" and 75° F. Applications are not recommended below 60°F or above 80°F. When daytime temperatures exceed 85°F over thinning may occur. Good thinning can be obtained under the latter conditions with lower rates of chemicals.
Tank mix combinations of K-Salt Fruit Fix 200 and Carbaryl (e.g. Sevin 4F & Sevin XLR Plus) have successfully thinned several early-maturing, heavy-setting varieties, as well as hard-to-thin apple varieties in accordance with the most restrictive of label limitations and precautions. Also a petal fall application of K-Salt Fruit Fix 200 followed 7-10 days later by an application of K-Salt Fruit Fix 200 + Carbaryl has improved thinning on hard-to-thin varieties such as Golden Delicious, Fuji, Gala, and Rhode Island Greening. No label dosage rates should be exceeded. This product can not be mixed with any product containing a label prohibition against such mixing.
Important: K-Salt Fruit Fix 200 should not be used on early season varieties (those that ripen before Macintosh) such as Yellow Transparent, Early Williams Red and Oldenburg since severe injury or overthinning may occur. Amid-Thin W is recommended for these early season varieties.